I think, as more and more information on US' involvement in the Israeli genocide come to light, we have to face the fact that American voters simply don't care. Both major parties enthusiastically participate in funneling US taxpayers' money to Israel, and watching them bomb children, hospitals, and innocent people day after day for an entire year hasn't changed public sentiment on that.
If anyone really cared about the genocide, they wouldn't vote Democrat or Republican. On this issue the parties are in complete agreement.